A casing of a power transmitting device is provided with a power transmitting device side passive electrode, a power transmitting device side active electrode, and a power transmitting module. A jacket mounted on a terminal is provided with a power receiving device side passive electrode, a power receiving device side active electrode, a power receiving module, and a DC-DC converter. A heat sink portion with fins is formed on a portion of the power transmitting device side passive electrode. When the terminal is mounted on the power transmitting device, the power receiving device side passive electrode is electrically connected to the power transmitting device side passive electrode, and the power receiving device side active electrode faces the power transmitting device side active electrode. In this state, the heat of the power receiving module and the DC-DC converter is dissipated from the power transmitting device side passive electrode.